Coffee-mill.



I NITED strarns PATENT OFFICE- FRANK 13mm, or H'oRNE rsvILLn, nnw 03K, ASSIGNOR,. BY ME'sNE ASSIGNMENTS, 2130 THE J. mnn COMPANY, 'moon'ro m'rnn, or HORNELL, NEWYO'RKJ COFFEE-MILL.

Specification-of Letters Patent.

Patented Maiee, 1910.

Application filed April 7, 1905. Serial No. 254,361.

,To, all whom it may concern:

Be known that I, FRANK.BARTZ, a citizen; of the-Unitecl-'States; residing at Hornellsville, in the county of Steuben and State-hf New York, have invented a Coffee- 19 part which the following is a specificationiuinventionis an improvement in cofa I 'lar dress of the grinding disks.

,Thciprincipal. object of'the invention is "a provide a pair of grinding disks. for a coffee mill whichshall be eflec'tive in operating, whereby to grind-the beans without under friction or heating thereof.

the stationary disk. Fig. 2 is a similar View of the companion disk, the rotary disk. Fig.

is a sectional View on the'line 33 of Fig.

a 1; 1 Fig. i is a sectional view onthe line f-Fig.2. Fig. 5 is'a diagram v-iew,'illusrating the arrangement of teeth on the shown in Fig. 1; andFig. 6 is a diaam' view,.illustrating the arrangement of teeth on the grindingdisk' shown in Fig. 2.

Referring to the drawings, M designates one of the grinding disks of a coffee mill, in the present instance the stationary grinding disk, and N designates the companion grindin disk, or the rotary disk.

e faces of the disks, between which the cofl'ee-be'ans are ground, are provided with inclined teeth .9, -Vs'haped at one end to form contiguous cutting edges oppositely" inclined from the face of the disk, whereby said teeth in operation act rather to cut the beans than mash or grind them as is usual, and these teeth are arranged on the respective disks in such manner as to produce a shear- .ngTcut and also to cut the beans into pieces smaller and smaller as they pass to the outer edges of the-disks. For this purposesaid teeth are arranged in concentric rows and the faces between the cutting edges are disposed on tangential lines extending from small circles near the central portion of the disks, the tangential lines'with respect to one disk extending in an opposite direction to those of the oth r disk when sald-disks ls; and relates more especially to the nary coffee-mills.

are brought toget-her, -This opposite ar rangement of the cutting faces produeesa.

shearing cut as the teeth of the opposite disks pass "each other. The teeth of each row, with the exception of the outer row at the margin of the disks, are spaced apart;

asshown, to form staggered recesses so that the coffee-beans and broken pieces thereof will-pass'int'o said recesses and be acted upon by the teeth as'the disk N revolves.

By reference to the diagram views of the drawings it will be seen that the concentric rows of teeth are arranged in groups occupying segments of the disk, and thatthe faces orcutting ends of the teeth are disposed on a plurality of lines extending paral lel to each other and tangentially from circles at the center of the disk, and that the outer ends 8% of the teeth are at right angles to the face of the. disk, see Figs. 3

and 4; It will also be seen that when the grinding disks are placed face to face, or in operative pos1t1on,'the tangential lines of one group, as 1, Fig. 5, will cross the tangential lines of a group, as 2, Fig. 5, at an angle. so that the teeth will cut with a shearing cut.

- It. will be understood that in operation the teeth on one of the grinding disks oppose those on the other; that is to say, the points of the V-shaped teeth on one disk project in the opposite direction to those on the otherdisk, also that as the teeth incline outward toward the .point they present diverging edges which act to cut-the bean, and

therefore there is not the friction and consequent heating of the particles usual in ordi- Having thus described my invention, What I claim as new, and desire to secure by Letters-Patent, is

1. In a coifee mill, a pair of grinding disks the cutting faces of which-are prog vided with concentric rows of inclined teeth each tooth having a V-sha'ped end at right angles to the disk forming contiguous cutting edges oppositelyiinclined from the face of the disk and. the V-shaped ends of the teeth of each disk disposed on tangential' lines extending from concentric circles 'at the center portion of the disk to the outer edge of said.disk, the tangential lines of one disk extending in an opposite direction-to the tangential lines of the other disk,,the teeth on the disks being spaced apart :to

provide staggered recesses, as herein shown and described.

2. A grinding disk or coffee mills having concentric rows of teeth V-shaped at their outer ends and arranged, in groups occupying segments of the disk, the cutting ends of the teeth of each group being arranged on a plurality of parallel lines extending tangentially from a corresponding plurality of circles near the center of the 3 A grinding disk for coffee mills having'concentric rows of teeth V-shaped at their outer ends and arranged in groups occupying segments of the disk, the cutting 15 ends of the teeth of each grou being a1" ran ed on a plurality of paral el lines ext'en ing tangentially from a corresponding number of circlesnnear the center of the disk,

.some of the teeth being removed to provide 20 recesses between teeth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- FRANK BARTZ.

Witnesses:

HOWARD L. GERBER, BARTLEY H. LAW. 

